[PATCH v3 1/8] nfsd: Report vetted delegated timestamps in GETATTR replies

[Jeff Layton <jlayton@kernel.org>]

When a CB_GETATTR reply shows the file modified, nfsd4_encode_fattr4()
overrides atime and mtime with the raw time_deleg_access and
time_deleg_modify values from the reply. cb_getattr_update_times() has
already vetted those values per RFC 9754 section 5 and written the
result to the inode, so the override undoes that vetting:

- a time older than the one at delegation grant, which the server
  ignores, is still reported to the querying client
- a time in the future is reported unclamped

vfs_getattr() runs after the update and already returns the vetted
times. Drop the override.

Fixes: 6ae30d6eb26b ("nfsd: add support for delegated timestamps")
Signed-off-by: Jeff Layton <jlayton@kernel.org>
---
 fs/nfsd/nfs4xdr.c | 6 ------
 1 file changed, 6 deletions(-)

diff --git a/fs/nfsd/nfs4xdr.c b/fs/nfsd/nfs4xdr.c
index 90b44163f886..434b6cfc5741 100644
--- a/fs/nfsd/nfs4xdr.c
+++ b/fs/nfsd/nfs4xdr.c
@@ -4098,14 +4098,8 @@ nfsd4_encode_fattr4(struct svc_rqst *rqstp, struct xdr_stream *xdr,
 		if (ncf->ncf_file_modified) {
 			++ncf->ncf_initial_cinfo;
 			args.stat.size = ncf->ncf_cur_fsize;
-			if (!timespec64_is_epoch(&ncf->ncf_cb_mtime))
-				args.stat.mtime = ncf->ncf_cb_mtime;
 		}
 		args.change_attr = ncf->ncf_initial_cinfo;
-
-		if (!timespec64_is_epoch(&ncf->ncf_cb_atime))
-			args.stat.atime = ncf->ncf_cb_atime;
-
 		nfs4_put_stid(&dp->dl_stid);
 	} else {
 		args.change_attr = nfsd4_change_attribute(&args.stat);

-- 
2.56.0